If you already have 25 speakers, you won't gain any more each day. The maximum amount for normal players is 25.
How many do you have now? Unless you buy them with ec you cant have more than 25, so if you already have 25, that would be why.
Have you tried restarting your app? Or have you been talking in campus and using your speakers? If restarting doesnt help, and you havent been talking in campus, then email support@athinkingape.com and explain the problem to them. Make sure to include your username and that you play pimd.